code: def decode(self, encoded_values_tensor):
      raise Exception("This encoder is not bi-directional")
  
file_path: lightwood/lightwood/encoder/text/tfidf.py
imports: import torch
  from sklearn.feature_extraction.text import TfidfVectorizer
  import numpy
  from lightwood.encoder.base import BaseEncoder
label_desc: Use image node_id 4 for calling the TfidfEncoder obj's underlying member method code with example usage: obj.decode(encoded_values_tensor) without return types